Sewer cleaning chemical dispensing nozzle

ABSTRACT

A TWO STAGE SEWER CLEANING CHEMICAL DISPENSING NOZZLE PARTICULARLY ADAPTED FOR UTILIZATION IN DISPENSING ROOT FUMIGANTS. THE NOZZLE INCORPORATES AN INTERNAL SPRING LOADED PRESSURE RESPONSIVE VALVE CONSTRUCTED WITH FRONT AND REAR NEEDL VALVES AND FRONT AND REAR VALVE SEATS RESPONSIVE TO PRESSURE VARIATIONS SELECTIVELY ACTIVATING REARWARD OR FORWARD JETS AS DESIRED FOR PROPULSION, CLEANING, OR CHEMICAL FUMIGANT DISPENSING.

Nov. 14, 1972 J. A. KIRSCHKE 3,702,685

SEWER CLEANING CHEMICAL DISPENSING NOZZLE FiledNov. 10, 1971 I8 16 u l2 F|G.1 33 18 I6 w 23 1 a2".;

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INVENTOR JOHN A. KIRSCHKE BY WT KW/ Patented Nov. 14, 1972 3,702,685 SEWER CLEANING CHEMICAL DISPENSING NOZZLE John A. Kirschke, P.0. Box 125, Boerne, Tex. 78006 'Confinuation-in-part of application Ser. No. 96,723, Dec. 10, 1970. This application Nov. 10, 1971, Ser. No. 197,245

Int. Cl. B05b 1/30 US. Cl. 239-533 8 Claims ABSTRACT OF THE DISCLOSURE A two stage sewer cleaning chemical dispensing nozzle particularly adapted for utilization in dispensing root fumigants. The nozzle incorporates an internal spring loaded pressure responsive valve constructed with front and rear needle valves and front and rear valve seats responsive to pressure variations selectively activating rearward or forward jets as desired for propulsion, cleaning, or chemical fumigant dispensing.

CROSS REFERENCES TO RELATED APPLICATIONS The nozzle of this invention is specifically designed and adapted for utilization with the equipment combination described in detail and claimed in my co-pending application, Ser. No. 36,901, filed May 13, 1970, entitled Root Fumigant Sewer Cleaning Sprayer. This application is a continuation-in-part of my co-pending application, Ser. No. 96,723, filed Dec. 10, 1970, now Pat. No. 3,656,694, entitled Sewer Cleaning Chemical Dispensing Nozzles.

BACKGROUND OF THE INVENTION Field of the invention A wide variety of hydraulic propelled and driven sewer cleaning or pipe line cleaning nozzles have been invented and patented. Several of these pertain to driving of cleaning blades or jets well known to the art such as your applicants Patents Nos. 3,432,872 and 3,449,783. Heretofore, no nozzle has been specifically designed with an internal pressure responsive valve varied in the adaptability or utilization between the sewer cleaning or propulsion of the nozzle carrying the hose and also capable of a second mode of operation particularly suited for chemical dispensing. The nozzle of this application is adapted to be secured to high pressure hose and jet propelled through a sewer line. In the second mode of operation, responsive to variation of pressure, the nozzle may be withdrawn from the line while dispensing chemicals in accordance with my application, Ser. No. 36,901.

SUMMARY OF THE INVENTION This nozzle incorporates a nozzle body into which is constructed a spring loaded pressure responsive valve. The design is such that a predetermined pressure variation of the fluid operates the valve which selects the desired jets through which the fluid is ejected. Summarily speaking, in the first mode of operation, high pressure overcomes the spring loading closing the forward jets and activating the rearward jets for propelling the hose through the line. In the second mode of operation, spring loading permits low pressure to close the rearward jets and the ejecting of fluid through the forward jets. This second mode is particularly suite-d for dispensing chemical root fumigants as the high pressure hose is withdrawn at a predetermined rate in accordance with the teaching of co-pending application 36,901. Another advantage of this mode of operation is to assist in the withdrawing of the hose and nozzles through P traps or around sharp turns in a conduit. The nozzle of this invention is capable of being constructed in an extremely compact, small configuration facilitating use in the small lines or conduits adjacent buildings and is capable of effective operation in an environment, to the best of knowledge of applicant, no other nozzle can operate.

BRIEF DESCRIPTION OF THE DRAWINGS For a detailed description of the construction of the nozzle of this invention, reference is made to the attached view wherein like reference characters will be used to refer to identical or equivalent components throughout the various views and the following detailed description of the preferred embodiment.

FIG. 1 is a planned view of the nozzle of this invention illustrating primarily the outer configuration and the exits of the forward jets and rear jets.

FIG. 2 is a sectional view of the device taken substantially on line 22 of FIG. 1 in the direction of the arrows. This view illustrates in section the relationship of the internal components of the device.

FIG. 3 is an exploded view in perspective illustrating the components of the device disassembled and arranged in the sequence in which they are to be assembled.

DESCRIPTION OF CONSTRUCTION OF THE PREFERRED EMBODIMENT For a description of a method of construction of the preferred embodiment, reference is made to 'FIGS. 1, 2, and 3. The nozzle 9 is preferably constructed from stainless steel in a screw machine type operation. Of course, a turret lathe or drill press operation might be utilized. The nozzle body 10 is machined with a rear section 11 to which is threadably attached a hose adapter 12. The forward section 13 is somewhat a mirrored construction of rear section 11. The center section 14 is machined to a depression which might include hexagonal or fiat portions to facilitate assembly and disassembly. The nozzle body 10 has constructed in it a body cavity 15 which penetrates and extends the full length of nozzle body 10. Forward jets 16 are drilled diagonally through the rear sectional 11 terminating in a forward jet seat 17 in the nozzle body 10 rear section 11. The forward jets 18 are drilled diagonally through the forward section 13 terminating at the rear jet seats 19. Fitted within the nozzle body 10 is a dual needle valve 20 which is preferably constructed of high carbon steel which may be beat treated or case hardened after machining. Dual needle valve 20 is constructed in two sections. The rear portion needle valve 22 has constructed in its inner face a forward jet needle valve 23 which is machined at an angle compatible with forward jet seat 17 in the nozzle body 10. The valve stem 25 is integral with the rear portion of the needle valve 22 which has constructed in it valve stem threads 26 to facilitate assembly and attaching of forward portion needle valve 21 which includes in its inner face rear jet needle valve 24 which is machined or contoured compatible with rear jet seat 19. There is also constructed in the forward portion of needle valve 21 a cylindrical detent which comprises a spring seat 28. A series of compact dish shaped cylindrical springs assembled in opposite facing pairs comprise the spring 27 of this device. The forward portion needle valve 21 and rear portion needle valve 22 are screwably secured together internal of the nozzle body suitably threadably constructed cap screw 29 is secured to the nozzle body 10. Adjusting plug 30 places spring 27 under compression adjusting the pressure responsive point of operation. There is drilled in or constructed through hose adapter 12 internal conduit 31 which is adapted to receive water from a high pressure hose. There must be drilled through or constructed in the rear portion of needle valve 22 a fluid passageway 32 which facilitates the flow of water from the hose (not shown) through conduit 31 into center section 14 body cavity 15. The fluid may be ejected through either forward jets 16 or rearward jets 18 depending on the mode of operation and the degree of pressure the fluid applies relative to the compression of springs 27 by adjusting plug 30. There is constructed in the forward portion of needle valve 21 and rear portion of needle valve 22 O-ring grooves 34 into which are rfitted suitable O-rings 33 to seal the dual needle valve 20 against the internal wall 35 of body cavity 15.

OPERATION AND USE For a description of the interrelationship of the various components of this device and its operation, reference is particularly made to FIG. 2. The nozzle 9 illustrated in FIG. 2 comprises two components which are in a measure mirror images of each other. The forward portion of the needle valve 24 operates in conjunction with the rear jets 18 and the rear jet seat 19. In the no or low pressure position, spring 27 keeps rear jet needle valve 24 in firm contact with rear jet seat 19 closing the rear jets 18. Forward jet needle valve 23- is held away from the forward jet seat 17; accordingly, fluid flows through the fluid passageway 32 and out through the forward jets 16. When high fluid pressure is applied to the nozzle 9, the dual needle valve assembly 20 shifts forward overcoming the pressure of spring 27 and forward jet seat 17 is contacted and sealed by forward needle valve 23. Simultaneously, rear jet needle valve 24 is lifted clear of rear jet seat 19 and a flow of fluid through fluid passageway 32 is then discharged through the rear jets 18.

Nozzle 9 of this invention has many uses in combination with the wide variety of high pressure sewer cleaning equipment well known throughout the industry. The nozzle 9 of this invention is capable of being utilized in the conventional manner for cleaning sewer lines or conduits employing its dual jet action in the manner required by the particular situation. Nozzle 9 as designed is particularly suitable for propulsion through small sewer lines adjacent the residence and will maneuver in extremely restricted areas such as P traps. After propelling the nozzle through the line, the reduction of pressure of the propelling fluid and activation of the forward jets 16 substantially assist in retrieving the hose and the nozzle 9. This nozzle is particularly adapted to be jet propelled through sewer lines and the forward jets 1'6 utilized for dispensing root killing chemical fumigant as the hose is withdrawn at a uniform desired constant rate. For a description of a specialized operation of this newly developed nozzle, reference is again made to my co-pending application No. 36,901. Employing high pressure operation, the nozzle 9 carrying the hose is propelled through the sewer line. The equipment combination may well include a hydraulic powered hose reel. In the cleaning operation, the hose may be withdrawn from the sewer line under maximum pressure operation. This eifectively cleans and loosens the slime and grease deposits and to an extent, removes small root deposits which have penetrated the sewer line. Utilizing the nozzle, pressure is reduced to permit spring 27 to seat rear jet needle valve 24 against the rear seat 19 and utilizing a reduced pumping rate, the fumigant chemicals may be dispensed through the forward jets 16 in rear section 11. The high pressure hose may be withdrawn at a constant coordinated pumping and withdrawal rate and the desired fumigant chemicals dispensed as desired in the portion of the sewer desired to be treated.

Having described in detail the preferred method of construction and the various modes of operation of the nozzle of this invention, what is desired to be claimed is all equivalent structures not departing from the scope of the invention as defined in the appended claims.

I claim:

1. An improved nozzle for cleaning a sewer line comprising:

(a) means for securing said nozzle to a high pressure hose,

(b) a nozzle body encasing a body cavity, said nozzle body including a forward section, a rear section and a center section, said rear section adapted to communicate with the high pressure hose,

(c) a pressure responsive spring loaded dual needle valve movably positioned in said body cavity, said valve comprising a forward jet needle valve and rear jet needle valve,

(d) a forward jet seat constructed in the rear section of said nozzle body,

(e) a rear jet seat constructed in the forward section of said nozzle body,

(f) at least one jet orifice projecting from said forward portion of said nozzle body,

(g) at least one jet orifice projecting from said rear portion of said nozzle body, and

(b) said valve and said nozzle so constructed and arranged as to selectively eject fluid from said jet projecting from said forward portion of said nozzle body and said jet orifice projecting from said rear portion of said nozzle body responsive to movement of said pressure responsive, spring loaded, dual needle valve.

2. The invention of claim 1 including an O-ring encircling said dual needle valve intermediate said valve and the internal wall of said body cavity, said O-ring contacting and sealing said valve relative to the internal wall of said body cavity.

3. The invention of claim 1 including a valve stem interconnecting said forward jet needle valve and said rear jet needle valve.

4. The invention of claim 1 wherein said rear jet needle valve is adapted to perform its valving function in conjunction with said rear jet seat positioned in said forward portion of said body cavity and said forward jet needle valve is adapted to perform its valving function in conjunction with said forward jet seat in said rear portion of said body.

'5. The invention of claim 1 wherein said jet seats and needle valves are so constructed and arranged as to release fluid from said rear jet when said forward needle valve is seated and said forward jet when said rearward needle valve is seated.

6. The invention of claim 1 wherein said pressure responsive spring loaded dual needle valve includes a multiplicity of dish shaped substantially circular springs mounted in said nozzle body, said springs adapted to spring load said pressure responsive needle valve.

7. The invention of claim '6 including an adjusting plug FOREIGN PATENTS screwably mounted in said nozzle body adapted to apply 1 017 819 1/1966 Great Britain c varying pressures to said dish shaped spring responsive to rotation of said adjusting plug. LLOYD L N 8. The invention of claim 1 wherein said forward jet 5 K1 Primary Examiner needle valve includes a fluid passageway. CL XE References Cited 134-467 g- 13 UNITED STATES PATENTS 3,275,247 9/1966 Hammelmann 239--Dig. 13 

